Saw this in the WTYP bonus episode. Gorgeous work, sir, as always. And add a 3rd pair of driving wheels and you'll more or less have my dream 1900's Ten-Wheeler there.
Wait that's still in happy wheels, isn't it? :) I really used to enjoy your levels, sad that the game basically died :( And btw, that's an amazing animation!
This valve gear seems to have the advantage of less vertically reciprocating offset mass than the Walschaerts valve gear. Is this correct? Or is this simply an artefact of the animations?
The main advantage of Stephenson gear is that the valve lead settings are variable, compared to constant lead for Walschaerts. Conversely, the main disadvantages of Stephenson are that it is often mounted between the frames and thus is harder to access for lubrication and maintenance, and with Stephenson gear you must raise and lower the entire expansion link + eccentric assembly, which in the days before power reverse gear was physically difficult as engines grew larger and their components grew heavier. With Walschaerts, you only need to raise and lower the radius rod.
This animation certainly makes the Stephenson valve gear easier to understand. I do have a question: what is the rod that's parallel to the drop link? It's connected to the transmission bar but not labeled. I'd like to see this motion in 3D! Great work!
it's just a link that supports the transmission bar vertically; the expansion link imparts horizontal motion to the transmission bar but needs to move vertically without lifting or lowering the transmission bar along with it
I was wondering about the technical aspects of your animation. Aside from your work, I'm unable to find a complete diagram of this motion. Most drawings leave out the transmission bar and drop link. I'm think of building a live steam loco with Stephenson valve gear. Thanks again!
Is the stephenson valve gear always connected to the middle axle of the driving wheels? I have a picture of a 4-6-0 locomotive where it looks like the reach rod extends all the way to in front of the first driving wheel axle. But I cannot find any references of the Stephenson Valve gear being connected to the front axle.
For the smoothest timing, valve gear tends to be connected to the same axle as the main rod whenever possible to keep it in sync; in some cases locomotives may need to put the eccentrics on other axles if, for example, the firebox or ash pan restrict clearances around the main driving axle, but this can result in less precise timing due to slop in the connecting rods between wheelsets.
Thanks for your reply. After looking at some real videos and images of the locomotive I realized that the illustration I was looking at was innacurate and that eccentrics were indeed put on the middle axle.
why does the expansion link ahve to be curved, why can't it be striaght like in the allan's valve gear. Why can allan's valve gear be straight how does it stop the need for a curved shape?
I believe the answer to this is that it ensures the cut-offs for the front and rear halves of the cylinder remain balanced for all positions of the reversing lever. I'm not familiar with the Allen's linkage - something for me to look up!
You know, it may be simple, but it’s also brilliant. Absolutely beautiful to watch.
This is a very nicely done animation, the parts are all well proportioned to make them clearly visible. Great work!
Saw this in the WTYP bonus episode. Gorgeous work, sir, as always. And add a 3rd pair of driving wheels and you'll more or less have my dream 1900's Ten-Wheeler there.
Wait that's still in happy wheels, isn't it? :)
I really used to enjoy your levels, sad that the game basically died :(
And btw, that's an amazing animation!
Tysm!
Now with a clear image of it, I can finally model this valve gear
This valve gear seems to have the advantage of less vertically reciprocating offset mass than the Walschaerts valve gear. Is this correct? Or is this simply an artefact of the animations?
The main advantage of Stephenson gear is that the valve lead settings are variable, compared to constant lead for Walschaerts. Conversely, the main disadvantages of Stephenson are that it is often mounted between the frames and thus is harder to access for lubrication and maintenance, and with Stephenson gear you must raise and lower the entire expansion link + eccentric assembly, which in the days before power reverse gear was physically difficult as engines grew larger and their components grew heavier. With Walschaerts, you only need to raise and lower the radius rod.
This animation certainly makes the Stephenson valve gear easier to understand. I do have a question: what is the rod that's
parallel to the drop link? It's connected to the transmission bar but not labeled. I'd like to see this motion in 3D! Great work!
it's just a link that supports the transmission bar vertically; the expansion link imparts horizontal motion to the transmission bar but needs to move vertically without lifting or lowering the transmission bar along with it
@@WingsStrings Thanks for the explanation. Now it makes sense to me.
@@WingsStrings how is this site / app you are using in this video called? Or did you make this yourself?
I was wondering about the technical aspects of your animation. Aside from your work, I'm unable to find a complete diagram of this motion. Most drawings leave out the transmission bar and drop link. I'm think of building a live steam loco with Stephenson valve gear. Thanks again!
Is the stephenson valve gear always connected to the middle axle of the driving wheels? I have a picture of a 4-6-0 locomotive where it looks like the reach rod extends all the way to in front of the first driving wheel axle. But I cannot find any references of the Stephenson Valve gear being connected to the front axle.
For the smoothest timing, valve gear tends to be connected to the same axle as the main rod whenever possible to keep it in sync; in some cases locomotives may need to put the eccentrics on other axles if, for example, the firebox or ash pan restrict clearances around the main driving axle, but this can result in less precise timing due to slop in the connecting rods between wheelsets.
Thanks for your reply. After looking at some real videos and images of the locomotive I realized that the illustration I was looking at was innacurate and that eccentrics were indeed put on the middle axle.
Does the lead increase as the valve gear is hooked up near center in the computer model?
huh....I dont think ive ever seen a Stephenson on an actual locomotive, seems like most locomotives in the US use the Walscherts
Which valve gear system is better, the stephenson or walschaerts?
I have the same question
Walschearts, it’s external so better for lubrication, allows for a better frame and less moving parts
@@louisvillenashvillerailroa5269Stephenson's looks like it has fewer moving parts than Walschaert's, so idk.
@@entity-bl5og There are more moving parts behind the wheels hidden from view.
@@UmoadoGaming oh. I did not know that
I dont quite get how the two eccentrics connect to the rear driver
Would love an animation of the Hackworth valve gear motion.
That gear reminds me of a dog with a limp on one of its back legs. But it is beautifully simple.
can You actually demonstrate Baker valve gear
what program is this? I wanted to try this for myself?
why does the expansion link ahve to be curved, why can't it be striaght like in the allan's valve gear. Why can allan's valve gear be straight how does it stop the need for a curved shape?
I believe the answer to this is that it ensures the cut-offs for the front and rear halves of the cylinder remain balanced for all positions of the reversing lever. I'm not familiar with the Allen's linkage - something for me to look up!
wondering what was better this or walshchaerts valve gear
It would probably depend on the specifics, but I'd bet my money on maintenance crews preferring walschaerts. Somewhat simpler and easier to reach.
Do you plan on doing a Baker valve gear test animation?
where can i get this simulation or is it not available
Can you make the baker valve gear please?
excuse me, where can i get this simulation?
please man. tell us what the software is so us could use
Ehats the name of this on HW?
Is this available anywhere?
This looks like a website, is it is whats it called
What game is this?
happy wheels
Is that an Website?
What is the name of the game
Is this Happy Wheels?
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